Most modern vehicles have two or more oxygen sensors. There are sensors housed in the vehicle’s exhaust system, where they are subjected to high operating temperatures and may become contaminated.
P2254 is an error code related to a fault in one of your oxygen sensor’s control circuits. Learn more about it through this article.
What Does the P2254 Sensor Mean?
Diagnostic trouble code (DTC) P2254 stands for “O2 Sensor Negative Current Control Circuit/ Open Bank 2 Sensor 1.”
A stored code P2254 indicates that the powertrain control module (PCM) has detected a negative current discrepancy in engine bank number two’s upstream oxygen (O2) sensor. Bank two is the engine bank without the number one cylinder. Sensor 1 is the downstream (pre-cat) sensor. A ground circuit is used in the negative current control circuit.
Oxygen sensors are usually located right in the path of the exhaust gas stream. These sensors monitor oxygen levels in both the exhaust stream and ambient air. The PCM uses data from heated oxygen sensors to monitor exhaust oxygen content for each engine bank as well as catalytic converter efficiency (HO2S). Data from the O2 sensors is communicated to the PCM using voltage signals.
If the PCM detects a level of voltage that does not correspond to acceptable parameters, a P2254 is stored.
Note: The definition of code P2254 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
What are the Common Causes of the P2254 Code?
- Malfunctioning O2 sensors
- Wiring and/or connector issues
- Faulty PCM/ PCM software update needed
What are the Common Symptoms of the P2254 Code?
- Poor fuel economy
- Decreased engine performance
- Illuminated check engine light
How to Diagnose a P2254 Code
P2254 can be logged on any vehicle equipped with an on-board diagnostic system. However, this doesn’t mean that there’s one diagnostic procedure that’ll work for all makes and models. Vehicles can be structured differently depending on their manufacturer. If you don’t have the technical know-how to get the job done, it’s best to leave the job to a trusted mechanic.
Here’s a video of what the diagnostic process might involve:
How to Fix the P2254 Code
P2254 is a tricky code. You’ll have to have the right tools and knowledge of O2 sensors to fix the issue correctly. You can always go to an auto repair shop and have a certified mechanic clear it for you. If you prefer to get your hands dirty and fix the issue yourself, it’s a good idea to review the appropriate repair manual or refer to an online repair database for vehicle-specific repair information.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.